CVE Explorer

CVE-2026-28432

Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:47a693d19bacdd058e830c3a70965917712412eef77b1811992042ad12eaece7

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"misskey","vendor":"misskey-dev","versions":[{"status":"affected","version":"< 2026.3.1"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:7603d8258ae783c1da5f1914b0d975afc59ca4db668c647c2e8ab3d289f53117 · sha256:0e6408815e59016a… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":7.1,"baseSeverity":"HIGH","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"PASSIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:7603d8258ae783c1da5f1914b0d975afc59ca4db668c647c2e8ab3d289f53117 · sha256:0e6408815e59016a… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion

{"cweId":"CWE-347","description":"CWE-347: Improper Verification of Cryptographic Signature","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:7603d8258ae783c1da5f1914b0d975afc59ca4db668c647c2e8ab3d289f53117 · sha256:0e6408815e59016a… · /containers/cna/problemTypes/0/descriptions/0

Source references

1 source assertion

{"name":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-grwc-c762-gcvp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/misskey-dev/misskey/security/advisories/GHSA-grwc-c762-gcvp"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:7603d8258ae783c1da5f1914b0d975afc59ca4db668c647c2e8ab3d289f53117 · sha256:0e6408815e59016a… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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